Brown azo dye.



UNITED STATES PATENT OFFICE.

AKIM TKATSOH, OF LUDWIGSHAFEN, GERMANY, ASSIGNOR TO THE BADISOHEANILIN 85 SODA FABRIK, OF SAME PLACE.

BROWN AZO DYE.

SPECIFICATION formingpart of Letters Patent No. 671,903, dated April 9, 1901.

Application filed November 10, 1900- Serial No. 36,105. (No specimens.)

To all whom it may concern:

Be it known that I, AKIM TKATSOH, doctor of philosophy, a subject of the Czar of Russia, residing at Ludwigshafen-on-the-Rhine,King dom of Bavaria,and Empire of Germany,have invented new and useful Improvements in Azo Dyes from Nitro-Amido-Phenol Sulfo- Acid and Hydroxy-Phenyl-Glycocol Sulfo- Acid III, of which the following is a specification.

In the German Patent No. 74,111 an ainidosulfo-acid known as amidosulfo-acid III is described. I have discovered that if this be treated with monochlor acetic acid in the presence of sodium acetate a new hydroxyphenyl-glycocol sulfo-acid is obtained. I call this hydroxy phenyl glycocol sulfo acid III. This constitutes a new component for the manufacture of azo dyes by combination with diazo compounds and the like. In particular I have discovered that the azo dye obtained from this new component and diazotized ortho nitro ortho amido phenol-para sulfo-acid is of value. It dyes wool chocolatebrown from the acid-bath. If the dyed goods be then treated with a chromate, the shade becomes lighter and redder and possesses a high degree of fastuess against the action of milling and does not bleed onto white wool, cotton, or silk during the operation.

The following examples will serve to further illustrate the manner in which the invention can be carried into practical effect and my new coloring-matter obtained. The parts are by weight.

Example 1P'rodacti0n of the new hydroacyphenyl-glycocol salfo acid III from the amidophenol sulfa-acid III. Dissolve one hundred and ninety (190) parts of the aforesaid amidophenol sulfo-acid III in one thousand (1,000) parts of Water. Then dissolve ninety-five (95) parts of monochlor acetic acid in this solution and add to it three hundred and forty (340) parts of crystallized sodium acetate. Boil this mixture for about five (5) hours in. a vessel fitted with an inverted condenser. Allow the temperature to fall and subsequently cool the solution thoroughly with the aid of ice. The acid sodium salt of the desired compound separates out. Collect it by the ortho-nitro-ortho-amid0-phenol-para sulfo- 6o acid in the well-known way and mix about twenty-four (24) parts thereof, contained in, say, three hundred (300) parts of water, with a solution of thirty (30) parts of the new hydroxy-phenyl-glycocol sulfo-acid III, such as can be obtained in accordance with Example 1, in about two hundred (200) parts of water containing sufficient calcined soda to maintain the mixture alkaline. Stir the solution until the combination is complete, precipi- 7o tate the coloring-matter with common salt, filter, press, and dry.

The new coloring-matter thus obtained dissolves in water, giving a blue-red solution,

which upon the addition of an excess of carbonate of soda turns wine-red in color. In concentrated sulfuric acid the color is orangeyellow.

Now what I claim is- The new azo coloring-matter which can be obtained by the combination of diazotized ortho nitro ortho amido-phenol-para sulfoacid and hydroxy-phenyl-glycocol sulfo-acid III which dyes Wool chocolate-brown from the acid-bath which shade becomes lighter and redder upon treatment with a chromate and which is soluble in water giving a blue-red solution which turns wine-red upon the addition of an excess of carbonate of soda and which gives an orange-yellow with concen- 9o trated sulfuric acid all substantially as described.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

AKIM TKATSCH.

Witnesses:

'ERNEST F. EHRHARDT,

JACOB ADRIAN. 

